McDonalds: Buy One Get One FREE Frappe, Smoothie, Strawberry Lemonade

McDonalds unveiled a new flavor of their fruit smoothies (Mango Pineapple) and they are offering a coupon for a Buy One Get One FREE, valid on the smoothies, frappes, or strawberry lemonade.  I'm not sure how long this coupon will be available, but once printed it expires 7/31/11.